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Old 07-14-2006, 11:50 PM   #1
JDM-STI
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Default Anyone use an '04 STI ECU in an '05 STI???

I know that there are a few pins that are different. 5 to be exact. Switching those are easy. Main reason I'm considering this is because my car doesn't want to go into open loop when its supposed to. It goes too late. This has started to become a common problem on some '05+ with big turbos. Ecutek and Cobb hasnt been able to find a fix for it. All '04's hit open loop right when it should everytime. So I'm exploring my options. I wonder how our key chip would be affected using an '04 ECU (which doesnt require one). Any and all input will be appreciated.
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Old 07-15-2006, 01:08 AM   #2
chuckdez
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Wouldn't there be a immobilizer issue?
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Old 07-15-2006, 05:32 AM   #3
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You can't use it unless you rewire alot of stuff!
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Old 07-15-2006, 08:39 AM   #4
JDM-STI
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Quote:
Originally Posted by Brydon
You can't use it unless you rewire alot of stuff!
It would have an Ecutek tune for my big turbo/meth. Ecutek hasn't been abe to solve my current issues on the '05 ECU. Been waiting on a fix for 2 months or so now.
Yes, the immobilizer has been thought about. I'm have the understanding that the immobilizer in the key communicated with the ECU. If there is an '04 ECU in there, I would think the immobilzer would not be a factor. Thats just my thinking anyway...
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Old 07-15-2006, 10:31 AM   #5
Cocoa Beach Bum
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I say: "Go for it, JDM-STI." And please let us know the results.
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Old 07-15-2006, 11:47 PM   #6
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Quote:
Originally Posted by Cocoa Beach Bum
I say: "Go for it, JDM-STI." And please let us know the results.
Easy for you to say...
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Old 07-16-2006, 12:28 AM   #7
chuckdez
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Is the 05 ECU stock or has it been reprogrammed via Cobb or EcuTek?
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Old 07-16-2006, 04:14 AM   #8
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Quote:
Originally Posted by JDM-STI
I would think the immobilzer would not be a factor.

...stop thinking
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Old 07-16-2006, 03:01 PM   #9
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Well there is a feature in the ECU programming called Closed Loop Delay. Possibly changed with a ECU reflash.
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Old 07-16-2006, 03:21 PM   #10
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Quote:
Originally Posted by chuckdez
Well there is a feature in the ECU programming called Closed Loop Delay. Possibly changed with a ECU reflash.
NON- issue with the STi
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Old 07-16-2006, 06:49 PM   #11
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Quote:
Originally Posted by Uncle Scotty
...stop thinking
Well...
What are your thoughts on this????
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Old 07-16-2006, 06:50 PM   #12
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Quote:
Originally Posted by chuckdez
Well there is a feature in the ECU programming called Closed Loop Delay. Possibly changed with a ECU reflash.
My tuner has tried everything under the sun without any success. Ecutek has no solutions either.
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Old 07-16-2006, 08:10 PM   #13
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^^^ There are no fueling delays in the STI OEM tune. The STI is exempt from the EPA mandate that the WRX falls under. I'm going to verify this right now to make sure I'm not making stuff up, but I know this is absoutely true for the 04 STIs.

*Edit*
Yep, every single "Open Loop" setting in the 04 and 05 USDM STI ROMs are identical.

Last edited by JRSCCivic98; 07-16-2006 at 08:23 PM.
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Old 07-16-2006, 10:09 PM   #14
JDM-STI
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Quote:
Originally Posted by JRSCCivic98
^^^ There are no fueling delays in the STI OEM tune. The STI is exempt from the EPA mandate that the WRX falls under. I'm going to verify this right now to make sure I'm not making stuff up, but I know this is absoutely true for the 04 STIs.

*Edit*
Yep, every single "Open Loop" setting in the 04 and 05 USDM STI ROMs are identical.
I'm not on an OEM tune. I am running a FP Red/Meth with all the supporting mods. The car is supposed to go to open loop at 2.5 MAF volts. Mine wont go till 3 volts. This causing some serious negative correction in my long and short term fuel trims. This problem has only been seen so far on '05+ STI's with big MAF/big turbo set ups.
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Old 07-16-2006, 10:28 PM   #15
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Quote:
Originally Posted by JDM-STI
I'm not on an OEM tune.
No kidding. You're more then likely on EcuTek and tuned Doug at TopSpeed. What I meant by OEM is that there's no delay in the OEM tune. With that said, your CL/OL settings cannot be stock if you have a BIG MAF. If you're running a BIG MAF you're more then likely running a scaled MAF map. So because of the scaled MAF map the switchover has inadvertantly been moved as well. There is a variable for OL switchover called Delayed Open Loop Load Threshold which by default is at 2.40g (which is roughly 1.13V on the OEM MAF scaling). So, if that scale has changed you need to also change that switchover from 2.40g to something that matches the newly scaled MAF map.
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Old 07-16-2006, 10:40 PM   #16
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Quote:
Originally Posted by JRSCCivic98
No kidding. You're more then likely on EcuTek and tuned Doug at TopSpeed.
Scott Siegel at Subaru of Gwinnett. He has reworked every open/close loop table and MAF scaling table available. Nothing has helped. Ecutek has been looking at my datalogging and trying to find a fix for better than 2 months now.
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Old 07-16-2006, 10:56 PM   #17
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Quote:
Originally Posted by JDM-STI
Scott Siegel at Subaru of Gwinnett.
Well, I was close.

Anyway, ask him if there's a table in there for the CL/OL delay I indicated above. It's possible that EcuTek doesn't have this in their software, but I'm not 100% sure. The table is definatly available in ecuEdit for 05 STI ROMs with the appropriate xml definition. Maybe he can download that software and play arround with it a little and see if the tables are the same between the two. There are a lot (more then the WRX) CL/OL transition tables in the STI ROMs... without knowing which EcuTek has made accessible or not I cannot tell you if he's truly exhausted all possible changeovers. It's definatly worth a look into at this point since he's exhausted every other avenue for a resolution of your problem.
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